package com.study.observermode.observer;

import com.study.observermode.subject.Subject;

/**
 * @ClassName: Observer
 * @Description:
 * @Details:
 * @Author: 郑港旭
 * @Create: 2021-11-16 14:48
 **/
public abstract class Observer {
    protected Subject subject;

    public abstract void update();
}
